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Mineralpedia Details for Proustite

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Proustite

Proustite

Named in honor of Joseph Louis Proust, a celebrated French chemist who was able to prove that substances combine in constant and definite proportions. Proustite is a late-forming hydrothermal mineral that develops in oxidized and enriched zones of the deposit along with other silver-bearing minerals and sulfides. There are hundreds of localities for Proustite, notable localities include Germany, Romania, the Czech Republic, France, Italy, the United States, Chile, and Mexico.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/proustite.pdf

Formula
Ag3AsS3 
Crystal System
Trigonal 
Crystal Habit
Massive, Crystalline - Poor, Blocky 
Cleavage
None, None, None 
Luster
Sub Metallic 
Color
vermilion, reddish gray 
Streak
vermilion red 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Sectile 
Hardness
2-2.5 
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PROUSTITE from Imiter mine, Anti-Atlas Mts., Dades Region, Morocco

PROUSTITE
            from Imiter mine, Anti-Atlas Mts., Dades Region, Morocco
Special Info
Phillips Collection

Deep, bright red prismatic micro crystals to 1mm throughout sulfide matrix.

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Proustite from Jachymov, Erzgegirge, Bohemia, Czech Republic

Proustite
            from Jachymov, Erzgegirge, Bohemia, Czech Republic

Nice old specimen of dull grey Arsenic with associated ruby red Proustite crystals 1mm.

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Proustite from O'Brien mine, Cobalt, Ontario, Canada

Proustite
            from O'Brien mine, Cobalt, Ontario, Canada

Cherry red needles of Proustite to 3mm in several vugs with Safflorit

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Proustite from San Genaro mine, Castrovirreyna, Huancavalica, Peru

Proustite
            from San Genaro mine, Castrovirreyna, Huancavalica, Peru

Deep ruby red single, nice crystal to 1cm.

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